e.zed

NHibernate for the Lazies

2008-10-30T13:30:00.002-06:00

I don't know about you, but sometimes if you want to learn a new framework, you want to see results right away. Most of the time, it never happens that way. Let's take nHibernate as an example. For somebody that is very new, you go to tutorials, how to create one and hope it works. One thing that pissed me off when I was learning NH back in the days, was writing those .hbm files.

Don't you wish there was an easy way to learn nHibernate, learn how to use sessions, transactions, unit of work, and all that good stuff? Ofcourse we have fluent-nhibernate as a good way to start up. But what if (1)you're using .net 2.0? (2)you don't like how integrated the mapping is with your application?

One day, I decided to spike a generator that generates your .hbm on the fly based on your domain objects.

Word of caution. I just used this as a spike, not a solution - More like a fast way of developing a small app without the pain of .hbm.xml files. Also, this exercise shows that you can have a domain model, totally ignorant how stuff is being saved to some kind of a persistance layer - hence mapping files. And finally it's totally doable to generate a mapping file on the fly based on your domain object.

Now let's talk code. The way this exercise was done, I was taking advantage of the Chain of responsibilty pattern to build the mapping files.

Before we go with any code, lets follow the basic rules:

Every .net data types are property elements
Every custom objects are many-to-one elements
Every IList<> are bag items

The Model

The Test

[TestFixture] public class HbmFilesSuckTest { private readonly string expected = @"<hibernate-mapping xmlns="'urn:nhibernate-mapping-2.2'" namespace="'ezed.workstuff.domain'" assembly="'ezed.workstuff.domain'"><class name="'Task'" table="'dbo.[Task]'"><id name="'Id'" type="'Int32'"><generator class="'identity'"></id><property name="'Description'"><property name="'Status'"><property name="'CreatedDate'"><property name="'CompletedDate'"><many-to-one name="'User'" column="'UserId'" class="'ezed.workstuff.domain.User'"><many-to-one name="'Priority'" column="'PriorityId'" class="'ezed.workstuff.domain.Priority'"><bag name="'Comments'"><key column="'TaskId'"><one-to-many class="'ezed.workstuff.domain.Comment'"></bag></class></hibernate-mapping>" .Replace(@"'", @""""); [Test] public void ShouldCreateValidHbmFile() { var actual = HbmFilesSuck.CreateMappingFileFrom<task>(); Assert.That(actual, Is.EqualTo(expected)); try { var configuration = new Configuration(); configuration.Configure(); configuration.AddXmlString(HbmFilesSuck.CreateMappingFileFrom<task>()); configuration.AddAssembly(typeof (Task).Assembly); } catch (Exception e) { Assert.Fail(string.Format("Your hbm file is sooo wrong! {0}", e)); } } }

The IHandler Interface

The Mapping File Builder

The Handlers

public class HibernateMappingHandler : IHandler { private readonly IHandler successor; public HibernateMappingHandler(IHandler successor) { this.successor = successor; } public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { var element = xml.CreateElement("hibernate-mapping") .WithAttribute("xmlns", "urn:nhibernate-mapping-2.2") .WithAttribute("namespace", itemType.GetType().Namespace) .WithAttribute("assembly", itemType.GetType().Assembly.GetName().Name); xml.AppendChild(element); successor.HandleRequest(xml, itemType); } } public class ClassNameHandler : IHandler { private readonly IHandler successor; public ClassNameHandler(IHandler successor) { this.successor = successor; } public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { xml.DocumentElement.WithElement("class") .WithAttribute("name", itemType.GetType().Name) .WithAttribute("table", string.Format("dbo.[{0}]", itemType.GetType().Name)); successor.HandleRequest(xml, itemType); } } public class IdHandler : IHandler { private readonly IHandler successor; public IdHandler(IHandler successor) { this.successor = successor; } public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { var idElement = xml.DocumentElement.WithElement("id").WithAttribute("name", "Id").WithAttribute("type", "Int32"); idElement.WithElement("generator").WithAttribute("class", "identity"); xml.SelectSingleNode(@"/hibernate-mapping/class").AppendChild(idElement); successor.HandleRequest(xml, itemType); } } public class PropertyHandler : IHandler { private readonly IHandler successor; public static readonly List<type> AllowedTypes; static PropertyHandler() { AllowedTypes = new List<type> { typeof (int), typeof (int?), typeof (bool), typeof (decimal), typeof (DateTime), typeof (DateTime?), typeof (string) }; } public PropertyHandler(IHandler successor) { this.successor = successor; } public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { foreach (var property in itemType.GetType().GetProperties()) { var getMethod = property.GetGetMethod(); if (string.Compare(property.Name, "Id", true) == 0) continue; if (!AllowedTypes.Exists(t => t.Equals(getMethod.ReturnType))) continue; var propertyElement = xml.DocumentElement.WithElement("property").WithAttribute("name", property.Name); xml.SelectSingleNode(@"/hibernate-mapping/class").AppendChild(propertyElement); } successor.HandleRequest(xml, itemType); } } public class ManyToOneHandler : IHandler { private readonly IHandler successor; public ManyToOneHandler(IHandler successor) { this.successor = successor; } public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { foreach (var property in itemType.GetType().GetProperties()) { var getMethod = property.GetGetMethod(); if (string.Compare(property.Name, "Id", true) == 0) continue; var returnType = getMethod.ReturnType; if (PropertyHandler.AllowedTypes.Exists(t => t.Equals(returnType))) continue; if (IsGenericCollection(returnType)) continue; var propertyElement = xml.DocumentElement.WithElement("many-to-one") .WithAttribute("name", property.Name) .WithAttribute("column", string.Format("{0}Id", property.Name)) .WithAttribute("class", returnType.FullName); xml.SelectSingleNode(@"/hibernate-mapping/class").AppendChild(propertyElement); } successor.HandleRequest(xml, itemType); } public static bool IsGenericCollection(Type type) { return type.IsGenericType && typeof(ICollection<>).MakeGenericType(type.GetGenericArguments()).IsAssignableFrom(type); } } public class BagHandler : IHandler { public void HandleRequest<itemtype>(XmlDocument xml, ItemType itemType) { foreach (var property in itemType.GetType().GetProperties()) { var returnType = property.GetGetMethod().ReturnType; if (!ManyToOneHandler.IsGenericCollection(returnType)) continue; var bagElement = xml.DocumentElement.WithElement("bag").WithAttribute("name", property.Name); bagElement.WithElement("key").WithAttribute("column", string.Format("{0}Id", itemType.GetType().Name)); bagElement.WithElement("one-to-many").WithAttribute("class", returnType.GetGenericArguments()[0].FullName); xml.SelectSingleNode(@"/hibernate-mapping/class").AppendChild(bagElement); } } }

The Implementation

SproutCore & WCF

2008-07-14T15:48:00.004-06:00

Before you start ctrl+c & ctrl+v'ing some source code, make sure you have tried the hello world sample and read the Rest API sample on the sproutcore wiki. Also, make sure you have played with FireBug to call some of the sproutcore commands shown in the sproutcore tutorials.

Ever since WWDC 2008 announced SproutCore, I got curius with how this javascript mvc framework communicates with a server backend. Since I have very limited knowledge of RoR rest, I decided to stick to what I know - WCF.

For my sample, I am using the contacts example that is posted on the sproutcore googlecode website.

JSON & DTO's
Let's start with how the Contacts JSON object should look like:

Notice how SproutCore collections has a defined format: {"records":[], "ids":[]}, also take notice on how the properties are defined: "first_name", "last_name" - Looks like sproutcore does some nyahh and puts underscores.

Now let's look @ the ContactDTO & SproutCoreContactDTO DataContracts in C# and let's make this work for sproutcore:

This is how we build the SproutCoreContactDTO object:

WCF Service & Web.Config

Now we've built out dto and have an idea how we build our JSON object, let's make WCF do some crazyness and send and take in DTO's as JSON from something that is not a .Net proxy!

Here's the service:

Notice how my methods are List, Create, Update, Show? That's taking advantage of sproutcore's built-in Record functionality.

Note that complex types like ContactDTO being consumed as a parameter must be a WebInvoke and an HTTP-POST method - you will have pain if u dont!

The key words to return your objects as JSON in WCF is "ResponseFormat = WebMessageFormat.Json"

Web.config (system.servicemodel configuration)

<system.servicemodel> <bindings> <webhttpbinding> <binding name="ezed.binding"> </webhttpbinding> </bindings> <behaviors> <endpointbehaviors> <behavior name="ezed.endpoint"> <webhttp> </behavior> </endpointbehaviors> <servicebehaviors> <behavior name="ezed.service"> <servicemetadata httpgetenabled="true"> <servicedebug includeexceptiondetailinfaults="true"> </behavior> </servicebehaviors> </behaviors> <services> <service behaviorconfiguration="ezed.service" name="ezed.spikes.services.ContactService"> <endpoint address="" behaviorconfiguration="ezed.endpoint" binding="webHttpBinding" bindingconfiguration="" name="" contract="ezed.spikes.services.ContactService"> </service> </services> </system.serviceModel>

Things to remember about your wcf service:
1) must be webHttpBinding to talk to any non-microsoft clients
2) must have a webHttp endpoint behavior

NUnit Tests
We could create a proxy to verify if our services work, but since we're going to be using sproutcore as our UI, we're going to do it the hard way. We're going to bust some serious System.Net skillz... soo peep this awesomeness:

[TestFixture] public class ContactServiceTest { private const string url = @"http://localhost:8080/ContactService.svc/{0}"; [Test] public void GetAll_ShouldGetAllContacts_UsingHttpGet() { var resultJsonDto = new WebClient().DownloadString(string.Format(url, "List")); var contacts = resultJsonDto.ToSproutCoreContactDTO(); Assert.That(contacts.Records.Length, Is.GreaterThan(1)); AssertExists("Jonas", "Awesome", contacts.Records); AssertExists("Gucci", "Player", contacts.Records); AssertExists("Dude", "Love", contacts.Records); } [Test] public void Create_ShouldCreateContact_UsingHttpPost() { HttpPost(new ContactDTO {Guid = 3, FirstName = "New", LastName = "One"}.ToJSON(), "Create"); HttpPost(new ContactDTO {Guid = 4, FirstName = "Second", LastName = "Two"}.ToJSON(), "Create"); var resultJsonDto = new WebClient().DownloadString(string.Format(url, "List")); var contacts = resultJsonDto.ToSproutCoreContactDTO(); AssertExists("New", "One", contacts.Records); AssertExists("Second", "Two", contacts.Records); } [Test] public void Update_ShouldUpdate_UsingHttpPost() { var client = new WebClient(); var resultJsonDto = client.DownloadString(string.Format(url, "Show/1")); var toUpdate = resultJsonDto.ToContactDto(); toUpdate.LastName = "changed"; HttpPost(toUpdate.ToJSON(), "Update"); resultJsonDto = client.DownloadString(string.Format(url, "Show/1")); var result = resultJsonDto.ToContactDto(); Assert.That(toUpdate.LastName, Is.EqualTo(result.LastName)); } [Test] public void Show_ShouldShowContactById_UsingHttpGet() { var resultJsonDto = new WebClient().DownloadString(string.Format(url, "Show/2")); var dudeLove = resultJsonDto.ToContactDto(); Assert.That(dudeLove.FirstName, Is.EqualTo("Dude")); Assert.That(dudeLove.LastName, Is.EqualTo("Love")); } private static void AssertExists(string firstName, string lastName, IEnumerable<contactdto> contacts) { Assert.That(from c in contacts where c.FirstName == firstName && c.LastName == lastName select c, Is.Not.Null); } private static void HttpPost(string jsonDto, string methodName) { var request = WebRequest.Create(new Uri(string.Format(url, methodName))); request.Method = WebRequestMethods.Http.Post; request.ContentType = "application/json"; var bytes = new ASCIIEncoding().GetBytes(jsonDto); request.ContentLength = bytes.Length; using (var stream = request.GetRequestStream()) stream.Write(bytes, 0, bytes.Length); } } internal static class TestExtensions { public static SproutCoreContactDTO ToSproutCoreContactDTO(this string json) { return ToItemType<sproutcorecontactdto>(json); } public static ContactDTO ToContactDto(this string json) { return ToItemType<contactdto>(json); } private static ItemType ToItemType<itemtype>(this string json) { using (var memoryStream = new MemoryStream(Encoding.Unicode.GetBytes(json))) return (ItemType)new DataContractJsonSerializer(typeof(ItemType)).ReadObject(memoryStream); } public static string ToJSON(this ContactDTO dto) { using (var stream = new MemoryStream()) { new DataContractJsonSerializer(typeof (ContactDTO)).WriteObject(stream, dto); return Encoding.Default.GetString(stream.ToArray()); } } }

Now that's some awesome shizzle! all works, and it's all good in the hood!

Apache, Mongrel, IIS - Fo Shizzle my Nizzle!

In order for your sc-server (mongrel) to have the proper resourceUrl for your WCF web service, we need to use a middleman as our reverse proxy - apache. Soo, we need to do the following:
1) download apache web server
2) make sure your port is something other than port 80 (I was running IIS and Apache on the same computer)
3) uncomment the following on httpd.conf:
- proxy_module
- proxy_ajp_module
- proxy_balancer_module
- proxy_connect_module
- proxy_http_module
4) add the following in the very bottom of httpd.conf:
#SproutCore Stuff
ProxyPass /contacts http://localhost:4020/contacts
ProxyPassReverse /contacts http://localhost:4020/contacts
ProxyPass /static http://localhost:4020/static
ProxyPassReverse /static http://localhost:4020/static
#IIS Stuff - Where my ContactService.svc is at
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/

With ReverProxy set-up, you can still go to localhost:4020, but your reference to your wcf service won't work. Depending on how you configured you apache server, you now have to access your sproutcore site via apache.

Finally! some sproutcore action!!
I'm assuming you have already exported the contacts sample from google code, and read "Using the built-in REST API".

We need to modify a couple of things so we can talk to our wcf service.

Model\contact.js

contacts\main.js

The Finished Product

With all your sc-gen, iisreset, and all that good stuff, run your site to see the final product.

And ofcourse, what's this long post without the sourcecode? download it from here or if you have svn, type "svn co http://ezed.googlecode.com/svn/spikes/SproutCore&WCF"

Boo & System.Collections.Generic

2008-07-09T16:20:00.007-06:00

i know there is the boo.lang.hash type, but i needed to use the IDictionary for this one.

Soo....

if you're busting some C#:

and if you're freestylin' with boo...

ClickOnce and Multiple Environments...

2008-06-19T20:16:00.002-06:00

This is dedicated to the peeps that have been googlin' how to handle multiple environments and using ClickOnce. When I mean multiple environments, you are deploying an application on multiple servers and in different environments, and the only difference are miniscule settings on the app.config file...

If you have:

- Multiple Instances of your ClickOnce app on Server 1

http://Server1/Development/MyApp.application

http://Server1/Test/MyApp.application

http://Server1/Production/MyApp.application

- Multiple Instances of your ClickOnce app on Server 1

http://Server2/Development/MyApp.application

http://Server2/Test/MyApp.application

http://Server2/Production/MyApp.application

With the setup above, all environments also have a manifest with the same name but just signed differently.

What's whacked is even though they are different applications when they download. What happens is the first one you download, will be the default app.config. This may sound crazy, but it's true...

After some googlin' and spiking up some shizzle, I decided to new InitializeKISSMethod() (keep it simple stupid!). And ended coming up with a naming convention of [server].[environment].application and [server].[environment].manifest. So it would looks like:

- Multiple Instances of your ClickOnce app on Server 1

http://Server1/Development/Server1.Development.application

http://Server1/Test/Server1.Test.application

http://Server1/Production/Server1.Production.application

- Multiple Instances of your ClickOnce app on Server 1

http://Server2/Development/Server2.Development.application

http://Server2/Test/Server2.Test.application

http://Server2/Production/Server2.Production.application

--------

So if you're a developer that is very depended on VS2005 (or 2008), this may be a lot of work! I would suggest automating this - will make your life ezed!

And remember, start with mageui.exe, then go all out with mage.exe. You will get a better understanding what's happenin' when you are bustin' some serious ClickOnce nyahhhh.

LinqToYourBrain Recap

2008-05-29T22:25:00.001-06:00

Thanks to Edmug for organizing tonights event and thanks to all the people that came and checked out my presentation - I enjoyed presenting!

For those who are interested playing with the source code, I have posted it on googlecode. So if you have subversion type:

svn checkout http://ezed.googlecode.com/svn/trunk/presentations/20080529_linqtosql

LinqToYourBrain

2008-05-13T22:01:00.000-06:00

Some of you may have heard, some have not. But I will be presenting an introduction to LinqToSql on May 29th.

Thanks to Edmug for hooking me up with a spot, and finally presenting to a public and devoted audience of developers.

See you there!

My MacBook Pro is F***ing Alive!!!!

2008-02-22T23:31:00.003-07:00

Well I was supposed to sell my macbook, but then when I had some interested buyers I found an ebay store that sold an 8x Dual-Layer Superdrive for $159USD - So I bought it!!!!

Then I decided to buy a 160GB 7200RPM hard drive, so my shit can compile faster when i'm coding.

All in all, the total cost of fixing my MBP was $314.23 which is awesome! I didn't go with buying a bottom case... just used a hammer, and a wooden train track from my kid's thomas the tank engine set to remove the dent.

And viola! It's installing Leopard as I type this!!

Notes:
- Go to ifixit.com and check out their detailed instructions how to open your MBP.
- Remember to hold the "C" button after you hear the "bong" sound - that makes your MBP boot up on you DVD drive.

Youporn! Here I come! I missed 1 week of your awesome content!!!

For Sale - Busted MacBook Pro (with Busted SuperDrive)

2008-02-13T22:33:00.002-07:00

Once upon a time... ahhh forget it. It's for sale for $500 for parts or if you want to spend some more money, you can buy a new SuperDrive and you have a cheap macbook pro. Hard drive not included.

Here are the specs:

- MBP 1st gen.
- ATI 256MB Video Card
- 2GB Ram
- new MagSafe power adapter
- OSX Leopard DVD
- 2 Macbook Pro batteries (Holy Sh*t!)
- Some awesome white decals

Long story short, I was updating my MBP with a software update, then something messed up so I needed to re-install.

But what I noticed was that there was a dent on the bottom case, so I couldn't fit my Leopard DVD (Damn pop-can).

So I opened my MBP, fixed the case, and then found that the SuperDrive (DVD) was busted.

As much as I wanna fix it, I don't have time.

"But Jonas, what about you brining it to the shop and getting it repaired?" - Nahhhhhh... I'm due for another laptop, and have been eye'ing on a macbook (black).

So if you have skill and the $500 to buy an awesome laptop that gave me my coding skills, this is the laptop for you! All you need is to buy a new hard drive, and a new SuperDrive. And you will have an uber facebook browser.

holla at me if you wants it... Oh yea, Canada only.

Below are some pics of the MBP.

I've been GoogleCoded!

2008-02-08T11:25:00.000-07:00

I have a bunch of spikes and some cool stuff that I wanna keep... so I decided to post it on google code....

To Check out the stuff that I have, go here: http://ezed.googlecode.com/svn/trunk/

YouTube: Scarface - Short Version

2008-02-04T03:20:00.000-07:00

I love the word fuck. Who is with me?

If James Keller was a DJ

2008-01-14T23:57:00.000-07:00

Referring to this post. He would DJ like our boy DJ Swamp!

Convert XML to HTML using NUnit

2008-01-04T10:28:00.001-07:00

[Test]
public void Convert_xml_to_html()
{
        string xml = @"<configuration> 
... 
  <system.diagnostics> 
    <trace autoflush='true' /> 
    <sources> 
      <source name='System.ServiceModel' 
              switchValue='Information, ActivityTracing' 
              propagateActivity='true'> 
        <listeners> 
          <add name='FuckingAwesomeWCFLogger' 
              type='System.Diagnostics.XmlWriterTraceListener' 
              initializeData='FuckingAwesomeWCF.log'  /> 
        </listeners> 
      </source> 
    </sources> 
  </system.diagnostics> 
...
</configuration>";
 
    Console.Out.WriteLine(xml.Replace("<", "&lt;").Replace(">", "&gt;").Replace("'", "&quot;").Replace("/", "&#47;").Replace("=", "&#61;"));
}

Logging on WCF Web Services

2008-01-04T10:15:00.000-07:00

Tired of wondering what error you have on your failing wcf service?

Add this to your web.cofig
<configuration>
...
<system.diagnostics>
<trace autoflush="true" />
<sources>
<source name="System.ServiceModel"
switchValue="Information, ActivityTracing"
propagateActivity="true">
<listeners>
<add name="FuckingAwesomeWCFLogger"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData="FuckingAwesomeWCF.log" />
</listeners>
</source>
</sources>
</system.diagnostics>
...
</configuration>

DJ'ing = f'in Awesome!

2008-01-02T23:04:00.000-07:00

I don't know about you, but DJ'in is soo awesome. Just makes you touch your music. Also another entertainment peice, another amunition for getting layed with the ladies (human - thanks Justice), and another reason why I'm always broke.

Well just wanted to give you peeps a DJ setup check with ezed!

Fig. 1.1 - My DJ steez and my white girl!

Fig. 1.2 - CDJ 1000MK3 & Rane Empath Steez

Fig 1.3 - Sqratch Steez - Tech 1200 M3D, Scratch Live, & Vestax PMC-07 Pro with Pro-X Fade

I said touch... hehehe.....

AES (Rijndael) Encryption in C# - The ezed Way.

2007-12-17T14:54:00.000-07:00

Wanna encrypt stuff? Well Check this awesome utility that i made...

Test....

using AwesomeUtilities;
using NUnit.Framework;
namespace Test
{
[TestFixture]
public class CryptographyUtilityTest
{
[Test]
public void Should_do_some_awesome_encrytion_stuff()
{
string toEncrypt = "Encrypt Me Stud";
string encrypted = CryptographyUtility.Encrypt(toEncrypt);
Assert.AreEqual(toEncrypt, CryptographyUtility.Decrypt(encrypted));
}
}
}

The shit that does the stuff

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace AwesomeUtilities
{
public abstract class CryptographyUtility
{
private static readonly string PASSWORD;
static CryptographyUtility()
{
PASSWORD = "MyUberPassword"; //Usually taken from a *.config
}
public static string Encrypt(string value)
{
return Encrypt(value, PASSWORD);
}
public static string Decrypt(string encryptedValue)
{
return Decrypt(encryptedValue, PASSWORD);
}
public static string Encrypt(string value, string password)
{
ValidateTextData(value, password);
Rfc2898DeriveBytes keyGenerator = new Rfc2898DeriveBytes(password, 8);
byte[] rawData = Encoding.Unicode.GetBytes(value);
using (MemoryStream memoryStream = new MemoryStream())
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, GetRijndaelWith(keyGenerator).CreateEncryptor(), CryptoStreamMode.Write))
{
memoryStream.Write(keyGenerator.Salt, 0, keyGenerator.Salt.Length);
cryptoStream.Write(rawData, 0, rawData.Length);
cryptoStream.Close();
return Convert.ToBase64String(memoryStream.ToArray());
}
}
public static string Decrypt(string encryptedValue, string password)
{
ValidateTextData(encryptedValue, password);
byte[] rawData = GetRawData(encryptedValue);
using (MemoryStream memoryStream = new MemoryStream())
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, GetRijndaelWith(new Rfc2898DeriveBytes(password, GetSalt(rawData))).CreateDecryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(rawData, 8, rawData.Length - 8);
cryptoStream.Close();
return Encoding.Unicode.GetString(memoryStream.ToArray());
}
}
private static Rijndael GetRijndaelWith(DeriveBytes keyGenerator)
{
Rijndael aes = Rijndael.Create();
aes.IV = keyGenerator.GetBytes(aes.BlockSize/8);
aes.Key = keyGenerator.GetBytes(aes.KeySize/8);
return aes;
}
private static byte[] GetRawData(string value)
{
byte[] rawData = Convert.FromBase64String(value);
if (rawData.Length < 8)
throw new ArgumentException("Invalid input value");
return rawData;
}
private static byte[] GetSalt(byte[] rawData)
{
byte[] salt = new byte[8];
for (int i = 0; i < salt.Length; i++)
salt[i] = rawData[i];
return salt;
}
private static void ValidateTextData(string value, string password)
{
if (string.IsNullOrEmpty(value))
throw new ArgumentException("No value given");
if (string.IsNullOrEmpty(password))
throw new ArgumentException("No password given");
}
}
}

WCF and Building your own Awesome WCF Web Service Proxy

2007-12-17T11:23:00.000-07:00

Hate using the svcutil.exe to generate your proxy for a WCF web service? Ever wondered if you can make it generic? You came to the right place!

I can't stand the MPP WCF Service Factory, I don't like svcutil, so I tried to make it pimp!

So for this example, we will be getting 3 pimp names from a wcf web service. If you are not familliar with WCF, here are some things that I did:

Used BasicHttpBinding to be backwards compatible with classic ASP.net
Implemented impersonation (refer to the web.config in the clientcredential type)
Did not use a *.config file on the client end, and hand rolled an awesome factory class that does some WCF kungfu!
Ofcourse, NUnit skillz

Let's start with the service

PimpNameService.svc

<%@ ServiceHost Language="C#" Debug="true" Service="AwwYeaFoo.PimpNameService" CodeBehind="PimpNameService.cs" %>

<%@ ServiceHost Language="C#" Debug="true" Service="AwwYeaFoo.PimpNameService" CodeBehind="PimpNameService.cs" %>

PimpNameService.cs

using System.Collections.Generic;
using System.ServiceModel;
using AwwYeaFoo.Interface;
namespace AwwYeaFoo
{
public class PimpNameService : IPimpNameService
{
[OperationBehavior(Impersonation = ImpersonationOption.Required)]
public IEnumerable<string> GetAllPimpNames()
{
IList<string> pimpNames = new List<string>();
pimpNames.Add("Python");
pimpNames.Add("Diamond Trim");
pimpNames.Add("Reverend J Fresh");
return pimpNames;
}
}
}

IPimpNameService.cs

using System.Collections.Generic;
using System.ServiceModel;
namespace AwwYeaFoo.Interface
{
[ServiceContract]
public interface IPimpNameService
{
[OperationContract]
IEnumerable<string> GetAllPimpNames();
}
}

web.config

<configuration>
<system.serviceModel>
<services>
<service behaviorConfiguration="returnFaults" name="AwwYeaFoo.PimpNameService">
<endpoint binding="basicHttpBinding" bindingConfiguration="PimpBinding"
name="PimpNameServiceEndPoing" contract="AwwYeaFoo.Interface.IPimpNameService" />
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="returnFaults">
<serviceMetadata httpGetEnabled="true" />
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<basicHttpBinding>
<binding name="PimpBinding">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Windows" />
</security>
</binding>
</basicHttpBinding>
</bindings>
</system.serviceModel>
</configuration>

The Test

[Test]

public void Should_get_all_pimp_names_using_the_AwesomeWCFWebServiceProxy()

{

using (AwesomeWCFWebServiceProxy<IPimpNameService> proxy =

new AwesomeWCFWebServiceProxy<IPimpNameService>(@"http://localhost/AwwYeaFoo/pimpnameservice.svc"))

{

IEnumerable<string> pimpNames = proxy.GetProxy().GetAllPimpNames();

foreach (string pimpName in pimpNames)

{

Console.Out.WriteLine(pimpName);

}

AwesomeWCFWebServiceProxy.cs

public class AwesomeWCFWebServiceProxy<WCFWebServiceInterface> : IDisposable
{
private BasicHttpBinding binding;
private ChannelFactory<WCFWebServiceInterface> factory;
protected WCFWebServiceInterface proxy;
private readonly string url;
public AwesomeWCFWebServiceProxy(string url)
{
this.url = url;
InitializeHTTPBinding();
InitializeChannelFactory();
InitializeProxy();
}
private void InitializeHTTPBinding()
{
binding = new BasicHttpBinding(BasicHttpSecurityMode.TransportCredentialOnly);
binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Windows;
}
private void InitializeChannelFactory()
{
factory = new ChannelFactory<WCFWebServiceInterface>(
binding, new EndpointAddress(url));
factory.Credentials.Windows.AllowedImpersonationLevel = TokenImpersonationLevel.Impersonation;
}
private void InitializeProxy()
{
proxy = factory.CreateChannel();
}
public WCFWebServiceInterface GetProxy()
{
return proxy;
}
public void Dispose()
{
((IChannel)proxy).Close();
factory.Close();
}
}

Excel Skills...

2007-11-28T14:44:00.000-07:00

Note to self:

If you (Jonas) wants to migrate excel data to a database the ghetto way, use this:

="insert into message (messageid, usermessage, systemmessage) values (" & A2 &", '" & SUBSTITUTE(B2, "'", "''") & "', '" & SUBSTITUTE(C2, "'", "''") & "' );"

OpenSocial API Tomorrow!

2007-10-31T12:52:00.000-06:00

wanna build a widget for hi5, linkedin, friendster, and all the other social networking sites?

Tomorrow Google will release it's OpenSocial API. Instead of learning a new *ML (markup language) you just code with regular javascript or html with the help of OpenSocial.

I'm not sure if this will work with facebook with it's FBML and all that jazz. I could be wrong.

Man, these portal's are the way to go for startups these days. Or build a porn site.

XmlSerialization using MemoryStream

2007-10-23T12:32:00.000-06:00

Here's a treat for you peeps that need some serialization action, and making it a utility... Check it!

public static string Serialize<ITEM_TO_SERIALIZE>(ITEM_TO_SERIALIZE itemToSerialize)
{
    using (MemoryStream memoryStream = new MemoryStream())
    {
        XmlSerializer serializer = new XmlSerializer(itemToSerialize.GetType());
        XmlTextWriter writer = new XmlTextWriter(memoryStream, new UTF8Encoding());
        writer.Formatting = Formatting.Indented;
        writer.IndentChar = ' ';
        writer.Indentation = 5;
 
        serializer.Serialize(writer, itemToSerialize);
 
        return ASCIIEncoding.UTF8.GetString(memoryStream.ToArray());
    }
}

Whoa! Where Have I Been?

2007-10-22T23:03:00.000-06:00

Been reading this: http://rfacebook.rubyforge.org/

And this....

 def select
  fql =  "SELECT uid, name FROM user WHERE uid IN" +
  "(SELECT uid2 FROM friend WHERE uid1 = #{@current_fb_user_id}) " +
  "AND has_added_app = 0"
  xml_friends = fbsession.fql_query :query => fql
  @friends = Hash.new
  xml_friends.search("//user").map do|usrNode|
    @friends[(usrNode/"uid").inner_html] = (usrNode/"name").inner_html
  end
  render_facebook
end

I will announce once my app is ready for the public!

Jonas is...

2007-08-01T21:23:00.001-06:00

は今の仕事が大嫌い。今転職先を探し中。

Jonas' Crazy Adventures in RoR - Part V - The Red thing Goes to my Wrist Watch... Oops!

2007-07-27T14:05:00.000-06:00

Okay, this may be the end of the long ass blogs that I'll be doing for this series. Most of the stuff after will be controller and UI related stuff.

But on part IV, we were talking about how to paginate with will_paginate. But we did not cover a login ONLY viewing their assigned-to projects. And here's how you do it. In AAA we have a current_user item that keeps track of the current user - We will take advantage of that. So check this out

With that simple change, you will only see the first two projects assigned to you!

Semi-Conclusion
I can't believe that building a website would be this ezed! Ruby & RoR is a framework that could not be compared with any programming technologies that I have used so far.

For those people who were curious, I used:
- TextMate **Highly Recommended
- iTerm
- macports
- Macbook Pro 1st get
- MySql

Jonas' Crazy Adventures in RoR - Part IV - Test Data, will_paginate, Page Security

2007-07-26T21:57:00.000-06:00

Okay, now we have a semi-well built model, let's see some UI action shall we? It won't be as fancy as you may think, but we're only focusing on the functionality right now and all that good stuff. in part deuce of the jonas series, we covered how to create a login acount using Acts as Authenticated (AAA). So that pretty much means that we have a user in the DB.

How do we verify this? script/console ofcourse! Below is a screenshot on how to verify if I have anything on my users table.

As you can see we have the one record - The account we made back in the days.

So let's go create some test data shall we? Again, I will be using the script/console style to insert my data... I'm going to create three new projects, and the first two will be assigned to the only user.

Here's how you do it:

Project.create :name => 'First Project', :description => 'This is my first project', :start_date => Date.today
Assignment.create :user_id => 1, :project_id => 2
Project.create :name => 'Second Project', :description => 'This is my second project', :start_date => Date.today
Assignment.create :user_id => 1, :project_id => 1
Project.create :name => 'Third Project', :description => 'This is my third project', :start_date => Date.today

Now let's check the database to show that I ain't bullsh*ttin'

Again, I just wanna let you guys know that I am intentionally making "Third Project" not assigned to any user. What I want to later is for the current user to be able to view his assigned projects.

Wait a sec. Jonas, I'm assuming u cannot add the same user to the same project more than once - How are you handling this?
Check this out suckah!

I want to see some UI action!!!!

I am going to cheat... I will be using script/generate scaffolding to generate my UI... But hey, at least I won't be coding a lot of stuff! The only difference is that I will be using a different method of pagination. I will be using will_paginate from errtheblog.

Lets just run our page for now, and see what we have:

Yay! we have a page! I will create 4 more test data to see the pagination stuff, and we will have 7:

Not bad, it works... but lets take a look at the list method that does the pagination stuff

"
You will notice that it returns two items! Soo ghetto! After talking with sideline. he pointed me to a rails cast about pagination found here. That will be the "new" way of pagination because in Rails 2.0 they will get rid of the ghetto-classic paging.

note: I semi-like will_paginate. the thing I don't like is that my model knows the implementation of paginate. If i used a presentation layer that handles the pagination, it would be better...

So what do we have to change?
list.rhtml, & product_controller.rb in the list method. Check out the before and after shots of the changes:

list.rhtml before

list.rhtml after

def list before

def list after

Not much change so it's all good!

Page Security

I will cover it briefly. Basically right now, we have a login page that does nothing, and our projects can be viewed by anyone. What we want to do is implement AAA's security stuff on our new project controller and here's how you do it:

That frikken ezed! now your anyone accessing project controller pages are required to login if they haven't yet.

This is jonas saying "alll right!"

Next time I will cover displaying only the projects a user is assigned to after login.

Luxuries of Riding Single Track

2007-07-25T23:43:00.000-06:00

Finding porn mags. left by some bum/12 year old kid/perv to be viewed by mtb'ers! I'm the one on the Surly 1x1

p.s. If you notice I blog a lot... I'm f*cking bored @ work!

Jonas' Crazy Adventures in RoR - Part III - Migration Files & Models/Domain Objects

2007-07-25T20:59:00.000-06:00

After the ezed stuff like login and creating your idea, now time to implement some ish...

So what did I do first? Create the model!

Step 1
below is a screen that I used to create my models/domain objects simply by bustin script/generate model <model_name>

once that is done, it will create a bunch of files... what we need to look for is the NNN_create_.rb where NNN is the version number. The cool thing is that it generated the crap that you need by default

now all you need to to create your fields

What I noticed is that there is no way by default to create your foreign keys on your migration file by default, you either have to (1)call the execute method I.E. "execute 'alter table....'" or (2)download a gem that does it for you. It looks like in rails development, all the relationships are built through your models/domain objects.

Step 2
Once you have finished creating your migration files time for the domain objects.

So lets start with the crazy ones... User, Assignment, & Project.

Before we begin check out the the relationship between user & project

You will notice we're busting a many to many relationship with users & projects through assignments.

This is how you implement the relationship in rails

and

once that "hard" part is done, everything else is ezed!

here's the most code I have done so far on my domain object

Well that's it for now... Stay tuned for testing the domain objects!

Jonas' Crazy Adventures in RoR - Part II - The Login

2007-07-24T21:42:00.000-06:00

I know, I showed some ghetto ERD skillz on part 1, but I would like to try out some of the gems out there that has a pimp implementation of user authentication.

I talked to sideline and the semi-hottest .rb developer in cowtown, and they recommended Acts as Authenticated. So I'm trying it...

So far, not so bad... Installing it was cakes script/plugin install http://svn.techno-weenie.net/projects/plugins/acts_as_authenticated
then
script/generate authenticated user account
then
update your database.yml with the proper credentials to your db
then if you're using mysql
mysqladmin -u root -p create <database name>
then
rake db:migrate

if all goes well, your iTerm should look like:

also, it will create a "Users" table on your database

So now what?

Check out what you created! goto your browser and type: http://localhost:3000/account/index
and you will see a signup page

once you register, you will see..

what the hell is that???
looking @ the account_controller.rb file, especially the index method it does some logic... check you the screenshot:

also, check out
<project>/app/views/account/index.rhtml... there it is! that weird poem... get rid of that, and put something that makes sense... for me it's jonas is a f*cking stud!

by viewing the account_controller.rb, you will get an idea all the stuff that is exposed: index, login, signup, logout
so that means when you go to your site, http://localhost:3000/accounts/<operation>, just put the operation you want, and you will do one of the four

This is ezed signing off for part deuce!... Watch out for part tres for the rake migrations! nyahhhhhHH!

Jonas' Crazy Adventures in RoR - Part I - The Idea

2007-07-24T20:12:00.000-06:00

After my pain, it is finally time to do some coding.

But I don't want to do any "hello rails" app, I want something that I would use. Well what do I need?

Iteration Management Tool!

I know... there are tons of those online, but hey I gotta do some shizzle. There is definately nothing wrong with my post-it notes style of showing my progress on a project, but it would be nice to do some graphs, some reporting, and some stuff to show me the status of my project on the world wide interweb.

Me and my buddy Neil had this idea before, but nothing really happened. I attempted in MonoRail, but it ended up like my other projects, I got lazy and moved on.

So for the idea, I whipped up a ghetto high-level database diagram of the tables. Nothing fancy... just what I need so far.

I really want this project to be a 2 week project, so I will pimp it up one day.

Stay tuned for Part deuce - the login!

peace! I'm uber pumped!

macports & ruby installation part II

2007-07-23T23:09:00.000-06:00

I had to post another one... F*cking thing is a pain when it's the first time running it....

So this post is dedicated to anyone that has a mac and wants to pursue a macport way of installing RoR & MySQL

1) Download & install iTerm
2) Download & install XCode 2.4.1
3) Download & install macports
4) update /etc/profile or ~/.profile with the following PATH="/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin"
5) open iTerm and type: sudo port selfupdate
6) install ruby: sudo port install ruby rb-rubygems rb-termios
7) install mysql sudo port install mysql5 +server
8) create a symbolic link to mysql.sock: sudo ln -s /opt/local/var/run/mysql5/mysqld.sock /tmp/mysql.sock
9) to autostart mysql: launchctl load -w /Library/LaunchDaemons/org.macports.mysql5.plist
10) configure mysql: sudo mysql_install_db5 --user=mysql
11) secure mysql: sudo -u mysql mysql_install_db5
12) start mysql: sudo -u mysql /opt/local/lib/mysql5/bin/mysqld_safe
13) update mysql root password: /opt/local/lib/mysql5/bin/mysqladmin -u root password 'your_password'
14) install ruby mysql adapter: sudo port install rb-mysql
15) Finally install rails and other stuff: sudo gem install rake rails capistrano mongrel mongrel_cluster deprec --include-dependencies

macports & ruby installation on my pimp macbook pro

2007-07-23T20:33:00.000-06:00

I've decided to give RoR a shot again but this time with macports. For those people on the mac trying to develop RoR apps, macports is the way to go!

But here are some things that I did when im installing ruby on my mac:
1) Google "macports+rails"
2) mongrel doesnt work if you install it after rails. to avoid this pain, type "sudo gem install -y mongrel mongrel_cluster rails"
3) When running the webserver for the first time, make sure you update your /etc/profile configuration file to use the macport ruby not the default mac ruby found on /usr/bin. Sooo change this: PATH="/bin:/sbin:/usr/bin:/usr/sbin" to this PATH="/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin"

Now go .rb'ing like a mofo!

p.s. If you bought

burn it and get

Rails changed dramatically on 1.2

Getting your CruiseControl.Net/.rb 's Project Status in C#

2007-07-09T23:04:00.000-06:00

Ever wondered how to get a CruiseControl.Net/.rb project status?

Below is a spike I did to see if I can do it.

using System;
using System.Runtime.Remoting;
using MbUnit.Framework;
using Rhino.Mocks;
using ThoughtWorks.CruiseControl.CCTrayLib.Configuration;
using ThoughtWorks.CruiseControl.CCTrayLib.Monitoring;
using ThoughtWorks.CruiseControl.Remote;
 
namespace i.ma.gine.spike
{
    [TestFixture]
    public class CruiseControlMonitorSpike
    {
        [Test]
        public void Create_ShouldCallCreate()
        {
            MockRepository mockery = new MockRepository();
            ICruiseProjectManager mockManager = mockery.CreateMock<ICruiseProjectManager>();
 
            ProjectStatus status = new ProjectStatus();
            Expect.Call(mockManager.ProjectStatus).Return(status);
            mockery.ReplayAll();
 
            ProjectMonitor monitor = new ProjectMonitor(mockManager);
            monitor.Poll();
 
            Assert.AreSame(status, monitor.ProjectStatus);
 
            mockery.VerifyAll();
        }
 
 
        [Test, Ignore("Just wanted to verify if I can actually connect to my CruiseControl.rb server")]
        public void Create_ShouldCallCreateRunningRealCruiseControlServer()
        {
            ICruiseProjectManagerFactory cruiseProjectManagerFactory =
                new CruiseProjectManagerFactory(new FakeCruiseManagerFactory(), new WebRetriever());
            ProjectMonitor monitor =
                new ProjectMonitor(
                    cruiseProjectManagerFactory.Create(
                        new Project("http://localhost:3333/XmlStatusReport.aspx", "imagine")));
            monitor.Poll();
            Console.Out.WriteLine(monitor.ProjectState);
            Console.Out.WriteLine(monitor.LastBuildTime);
        }
    }
 
    public class FakeCruiseManagerFactory : ICruiseManagerFactory
    {
        public ICruiseManager GetCruiseManager(string url)
        {
            return (ICruiseManager) RemotingServices.Connect(typeof (ICruiseManager), url);
        }
    }
}

With the following spike above, I was able to do this in code:

public static string Format(ICruiseControlProject project)
{
    try
    {
        if (project.ProjectMonitor.ProjectState.ToString() == "Success")
            return GetHTMLString(project.ProjectMonitor, "green");
 
        return GetHTMLString(project.ProjectMonitor, "red");
    }
    catch
    {
        return string.Format("<font color=\"red\">{0}</font>", project.ProjectMonitor.ProjectState);
    }
}
 
private static string GetHTMLString(IProjectMonitor monitor, string fontColor)
{
    return
        string.Format("<font color=\"{2}\">{0} - {1}</font>", monitor.ProjectState,
                      ((ProjectMonitor) monitor).LastBuildTime, fontColor);
}

Note:
I imported the following .dll's from CCTray (1)ThoughtWorks.CruiseControl.CCTrayLib.dll (2)ThoughtWorks.CruiseControl.Remote.dll

Google Reader

2007-07-06T00:50:00.000-06:00

Anyone know why Google Reader takes a long time to show new posts from blogger.com?

I had a post on July 2, and I just saw it on my google reader on July 6th.

Anyone has an answer to this?

Passive View + Rhino Mocks = P.I.M.P.

2007-07-06T00:24:00.000-06:00

Okay, my previous post, I said that nMock2 was better - I changed my mind.

It was just that I didn't know how to use the damn tool. But having used Rhino Mocks for over 8+ months now It has become my favorite mocking tool...

To show you guys some nyahh, check this passive view mvp test using rhino:

[Test]
public void Load_ShouldLoadView()
{
    MockRepository mockery = new MockRepository();
    IPimpBlogView view = mockery.CreateMock<IPimpBlogView>();
    IBlogPostTask task = mockery.CreateMock<IBlogPostTask>();
 
    view.Load += null;
    IEventRaiser raiser = LastCall.Constraints(Is.NotNull()).GetEventRaiser();
    Expect.Call(task.GetBlogPosts()).Return(new List<IBlogPost>());
    view.BlogPosts = new List<IBlogPost>();
    LastCall.IgnoreArguments();
 
    mockery.ReplayAll();
 
    new PimpBlogPresenter(view, task);
    raiser.Raise(null, null);
    mockery.VerifyAll();
}

As you can see from the above test, that is f'in pimp... I used an event raiser to raise my "Load" method to pretend it did stuff to load all my blog posts...

Below is the code for the passive mvp for those who missed out on the "pink" of enterprise development last year:

public class PimpBlogPresenter
{
    private readonly IBlogPostTask task;
 
    public PimpBlogPresenter(IPimpBlogView view, IBlogPostTask task)
    {
        this.task = task;
        view.Load += delegate { HookUpEventsFor(view); };
    }
 
    public PimpBlogPresenter(IPimpBlogView view) : this(view, new BlogPostTask())
    {
    }
 
    private void HookUpEventsFor(IPimpBlogView view)
    {
        view.BlogPosts = task.GetBlogPosts();
    }
}

The Form & View

public partial class PimpBlog : Page, IPimpBlogView
{
    #region IPimpBlogView Members
 
    public IEnumerable<IBlogPost> BlogPosts
    {
        set
        {
            blogPostRepeater.DataSource = value;
            blogPostRepeater.DataBind();
        }
    }
 
    #endregion
 
    protected override void OnInit(EventArgs e)
    {
        new PimpBlogPresenter(this);
        base.OnInit(e);
    }
}

public interface IPimpBlogView
{
    IEnumerable<IBlogPost> BlogPosts { set; }
    event EventHandler Load;
}

In conclusion, Rhino Mocks is pimp. Thanks Ayende for making such an awesome weapon for dealing with the pain!

My DJ Setup

2007-07-02T22:45:00.000-06:00

- Macbook Pro (1st Gen)
- Vestax - VCI 100 MIDI Controller
- M-Audio Fast Track Pro Audio Interface
- Vestax PMC 07 Mixer
- Technics 1200 M3D
- My Awesome Skills!

IEnumerable, Fluent Interfaces, Specification Pattern = Ménage à trois

2007-06-12T20:59:00.000-06:00

Since I haven't blogged for months, might as well bust a Ménage à trois post.

In this post you will learn the following:

- An implementation of IEnumerable<T>
- Fluent interfaces
- Simpe implementation of the Specification Pattern

To begin, here's the test...

using System.Collections;
using System.Collections.Generic;
using MbUnit.Framework;
using specification;
 
namespace test
{
    [TestFixture]
    public class InventoryTest
    {
        [Test]
        public void Add_ShouldBuildInventory_UsingAdd_ButItIsNotAsCool()
        {
            Inventory musicalInstrumentInventory = new Inventory();
            musicalInstrumentInventory.Add(new MusicalInstrument("Guitar"));
            musicalInstrumentInventory.Add(new MusicalInstrument("Turntables"));
            musicalInstrumentInventory.Add(new MusicalInstrument("Drums"));
            musicalInstrumentInventory.Add(new MusicalInstrument("Banjo"));
 
            int totalMusicalInstruments = 0;
            IEnumerator enumerator = musicalInstrumentInventory.GetEnumerator();
            while (enumerator.MoveNext())
            {
                totalMusicalInstruments++;
            }
 
            Assert.AreEqual(4, totalMusicalInstruments);
        }
 
        [Test]
        public void With_ShouldBuildInventory_UsingFluentInterface()
        {
            Inventory musicalInstrumentInventory = new Inventory()
                .With(new MusicalInstrument("Guitar"))
                .With(new MusicalInstrument("Turntables"))
                .With(new MusicalInstrument("Drums"))
                .With(new MusicalInstrument("Banjo"));
 
            int totalMusicalInstruments = 0;
            IEnumerator enumerator = musicalInstrumentInventory.GetEnumerator();
            while (enumerator.MoveNext())
            {
                totalMusicalInstruments++;
            }
 
            Assert.AreEqual(4, totalMusicalInstruments);
        }
 
        [Test]
        public void FindAll_ShouldFindGuitar()
        {
            MusicalInstrument guitar = new MusicalInstrument("Guitar");
            Inventory musicalInstrumentInventory = new Inventory()
                .With(guitar)
                .With(new MusicalInstrument("Turntables"))
                .With(new MusicalInstrument("Drums"))
                .With(new MusicalInstrument("Banjo"));
 
            MusicalInstrument resultGuitar =
                    new List<MusicalInstrument>
                        (
                            musicalInstrumentInventory.FindAll(new GetGuitarSpecification())
                        )[0];
 
            Assert.IsTrue(guitar.Equals(resultGuitar));
        }
 
        private class GetGuitarSpecification : ISpecification<MusicalInstrument>
        {
            public bool IsSatisfiedBy(MusicalInstrument item)
            {
                return item.Name.Equals("Guitar");
            }
        }
    }
}

Now the code...

using System.Collections;
using System.Collections.Generic;
 
namespace specification
{
    public class Inventory : IEnumerable<MusicalInstrument>
    {
        private List<MusicalInstrument> instruments;
 
        public Inventory()
        {
            instruments = new List<MusicalInstrument>();
        }
 
        public void Add(MusicalInstrument musicalInstrument)
        {
            instruments.Add(musicalInstrument);
        }
 
        public Inventory With(MusicalInstrument musicalInstrument)
        {
            Add(musicalInstrument);
            return this;
        }
 
        public IEnumerable<MusicalInstrument> FindAll(ISpecification<MusicalInstrument> specification)
        {
            return instruments.FindAll(delegate(MusicalInstrument instrument)
                                           {
                                               return specification.IsSatisfiedBy(instrument);
                                           });
        }
 
        IEnumerator<MusicalInstrument> IEnumerable<MusicalInstrument>.GetEnumerator()
        {
            return instruments.GetEnumerator();
        }
 
        public IEnumerator GetEnumerator()
        {
            return instruments.GetEnumerator();
        }
    }
}

And finally the ISpecification Interface

namespace specification
{
    public interface ISpecification<PersistentItem>
    {
        bool IsSatisfiedBy(PersistentItem item);
    }
}

Unit of Work Pattern - Take 2

2007-03-20T14:34:00.000-06:00

I attempted the Unit of Work pattern a couple of times (here) and (here)

But I think during the JP bootcamp, we were talking about how the implementation in the Fowler book is very cluttered. Domain objects know about the unit of work, bla, bla bla... I decided to take a stab on implementing a UoW with Domain objects not knowing about the pattern... Before I go, I kind of cheated with making my domain object know how to mark it self.

And if you want the source code, download it (here).

The Test

    1 using System.Collections.Generic;
    2 using MbUnit.Framework;
    3 using Rhino.Mocks;
    4 using unitofwork.spike.Dataaccess;
    5 using unitofwork.spike.Domain;
    6 using unitofwork.spike.utility;
    7 
    8 namespace unitofwork.spike.test.Task
    9 {
   10     [TestFixture]
   11     public class UnitOfWorkTest
   12     {
   13         private MockRepository mockery;
   14         private IDatabaseConnection connection;
   15         private IMapper mapper;
   16 
   17         [SetUp]
   18         public void Setup()
   19         {
   20             mockery = new MockRepository();
   21             mapper = mockery.CreateMock<IMapper>();
   22             connection = mockery.CreateMock<IDatabaseConnection>();
   23             DependencyResolver.Add(typeof (FakeUser), mapper);
   24         }
   25 
   26         [TearDown]
   27         public void TearDown()
   28         {
   29             mockery.VerifyAll();
   30             DependencyResolver.Remove(typeof (FakeUser));
   31         }
   32 
   33         [Test]
   34         public void ShouldInstanciate()
   35         {
   36             mockery.ReplayAll();
   37             IUnitOfWork work = new UnitOfWork(connection);
   38 
   39             Assert.IsNotNull(work);
   40         }
   41 
   42         [Test]
   43         public void Commit_ShouldCommit_OnlyRegisterNew()
   44         {
   45             FakeUser user = new FakeUser();
   46 
   47             mapper.Save(connection, user);
   48             connection.Dispose();
   49 
   50             mockery.ReplayAll();
   51 
   52             IUnitOfWork work = new UnitOfWork(connection);
   53 
   54             work.RegisterNew(user);
   55             work.Commit();
   56         }
   57 
   58         [Test]
   59         public void Commit_ShouldCommitABunchOfStuff()
   60         {
   61             IList<IDomainObject> fakeUsers = new List<IDomainObject>();
   62             FakeUser firstUser = new FakeUser();
   63             FakeUser secondUser = new FakeUser();
   64             FakeUser thirdUser = new FakeUser();
   65             FakeUser fourthUser = new FakeUser();
   66             FakeUser fifthUser = new FakeUser();
   67 
   68             firstUser.Mark = Mark.New;
   69             secondUser.Mark = Mark.Dirty;
   70             thirdUser.Mark = Mark.Delete;
   71 
   72             fakeUsers.Add(firstUser);
   73             fakeUsers.Add(secondUser);
   74             fakeUsers.Add(thirdUser);
   75             fakeUsers.Add(fourthUser);
   76             fakeUsers.Add(fifthUser);
   77 
   78             mapper.Save(connection, firstUser);
   79             mapper.Update(connection, secondUser);
   80             mapper.Delete(connection, thirdUser);
   81 
   82             connection.Dispose();
   83 
   84             mockery.ReplayAll();
   85 
   86             IUnitOfWork work = new UnitOfWork(connection);
   87 
   88             work.Register(fakeUsers);
   89             work.Commit();
   90         }
   91 
   92         private class FakeUser : IDomainObject
   93         {
   94             private Mark mark;
   95 
   96             public Mark Mark
   97             {
   98                 get { return mark; }
   99                 set { mark = value; }
  100             }
  101         }
  102     }
  103 }

The Code

    1 using System.Collections.Generic;
    2 using unitofwork.spike.Dataaccess;
    3 using unitofwork.spike.Domain;
    4 
    5 namespace unitofwork.spike.utility
    6 {
    7     public class UnitOfWork : IUnitOfWork
    8     {
    9         private readonly IDatabaseConnection connection;
   10         private IList<IDomainObject> registerNew;
   11         private IList<IDomainObject> registerDirty;
   12         private IList<IDomainObject> registerDelete;
   13 
   14         public UnitOfWork(IDatabaseConnection connection)
   15         {
   16             this.connection = connection;
   17             registerNew = new List<IDomainObject>();
   18             registerDirty = new List<IDomainObject>();
   19             registerDelete = new List<IDomainObject>();
   20         }
   21 
   22         public UnitOfWork() : this (DependencyResolver.GetImplementationOf<IDatabaseConnection>(typeof(IDatabaseConnection)))
   23         {
   24         }
   25 
   26         public void RegisterNew(IDomainObject domainObject)
   27         {
   28             registerNew.Add(domainObject);
   29         }
   30 
   31         public void RegisterDirty(IDomainObject domainObject)
   32         {
   33             registerDirty.Add(domainObject);
   34         }
   35 
   36         public void RegisterDelete(IDomainObject domainObject)
   37         {
   38             registerDelete.Add(domainObject);
   39         }
   40 
   41         public void Register(IList<IDomainObject> domainObjects)
   42         {
   43             foreach (IDomainObject domainObject in domainObjects)
   44             {
   45                 if (domainObject.Mark != null)
   46                 {
   47                     if (domainObject.Mark == Mark.New)
   48                         RegisterNew(domainObject);
   49 
   50                     if (domainObject.Mark == Mark.Dirty)
   51                         RegisterDirty(domainObject);
   52 
   53                     if (domainObject.Mark == Mark.Delete)
   54                         RegisterDelete(domainObject);
   55                 }
   56             }
   57         }
   58 
   59         public void Commit()
   60         {
   61             using (connection)
   62             {
   63                 try
   64                 {
   65                     Save(connection);
   66                     Update(connection);
   67                     Delete(connection);
   68                 }
   69                 catch
   70                 {
   71                     connection.Rollback();
   72                 }
   73             }
   74         }
   75 
   76         private void Delete(IDatabaseConnection connection)
   77         {
   78             foreach (IDomainObject domainObject in registerDelete)
   79             {
   80                 DependencyResolver.GetImplementationOf<IMapper>(domainObject.GetType()).Delete(connection, domainObject);
   81             }
   82         }
   83 
   84         private void Update(IDatabaseConnection connection)
   85         {
   86             foreach (IDomainObject domainObject in registerDirty)
   87             {
   88                 DependencyResolver.GetImplementationOf<IMapper>(domainObject.GetType()).Update(connection, domainObject);
   89             }
   90         }
   91 
   92         private void Save(IDatabaseConnection connection)
   93         {
   94             foreach (IDomainObject domainObject in registerNew)
   95             {
   96                 DependencyResolver.GetImplementationOf<IMapper>(domainObject.GetType()).Save(connection, domainObject);
   97             }
   98         }
   99     }
  100 }

The other Crap

    1 namespace unitofwork.spike.Domain
    2 {
    3     public interface IDomainObject
    4     {
    5         Mark Mark { get; set; }
    6     }
    7 }

    1 namespace unitofwork.spike.Domain
    2 {
    3     public sealed class Mark
    4     {
    5         public static readonly Mark New = new Mark();
    6         public static readonly Mark Dirty = new Mark();
    7         public static readonly Mark Delete = new Mark();
    8     }
    9 }

    1 using unitofwork.spike.Domain;
    2 
    3 namespace unitofwork.spike.Dataaccess
    4 {
    5     public interface IMapper
    6     {
    7         void Save(IDomainObject domainObject);
    8         void Save(IDatabaseConnection connection, IDomainObject domainObject);
    9         void Update(IDomainObject domainObject);
   10         void Update(IDatabaseConnection connection, IDomainObject domainObject);
   11         void Delete(IDomainObject domainObject);
   12         void Delete(IDatabaseConnection connection, IDomainObject domainObject);
   13     }
   14 }

Yessssss

2007-03-12T20:10:00.000-06:00

http://cruisecontrolrb.thoughtworks.com/

Castle Projects - Active Record

2007-03-11T17:14:00.000-06:00

I don't know about you, but I'm really lazy with bustin' some SQL madness, data mapper tests are a pain, nhibernate .hbm.xml files are a pain!!!

What can a simple developer do to quickly build up a data access layer, and still look pimp?

I came across ActiveRecord by CastleProjects a couple of months ago. It is using ofcourse the active record pattern shown on that Fowler book about enterprise patterns. It uses nhibernate libraries without the pain of creating those damn hibernate files. It just uses System.Attribute

Below is a sample code that I did up just to see how fast it was for me to create a dataaccess layer:

ofcourse we have to start with a Test...

using cargo.domain;
using MbUnit.Framework;
 
namespace cargo.test
{
    [TestFixture]
    public class UserTest_DataAccess
    {
        [Test]
        public void ShouldHandleActiveRecordFunctionality()
        {
            Company company = DomainObjectFactory.CreateTestCompany();
            company.Save();
 
            User user = new User();
            user.UserName = "jonas";
            user.Password = "test";
            user.Company = company;
 
            user.Save();
 
            AssertUser(User.FindBy(user.UserName), user);
 
            user.UserName = "updated";
            user.Password = "updated2";
 
            user.Update();
 
            AssertUser(User.FindBy(user.Id), user);
 
            user.Delete();
 
            Assert.IsNotNull(Company.FindBy(company.Id));
            company.Delete();
            Assert.IsNull(Company.FindBy(company.Id));
 
 
            Assert.AreEqual(0, User.FindAll().Length);
        }
 
        private static void AssertUser(User result, User user)
        {
            Assert.AreEqual(result.UserName, user.UserName);
            Assert.AreEqual(result.Password, user.Password);
        }
    }
}

and now the code....


using Castle.ActiveRecord;
using NHibernate.Expression;
 
namespace cargo.domain
{
    [ActiveRecord("CARGO_USER")]
    public class User : ActiveRecordBase<User>, IUser
    {
        private int id;
        private string userName;
        private string password;
        private int status;
        private Company company;
 
        public User()
        {
            ActiveRecordInitializer.Initialize(GetType().Assembly);
        }
 
        public static User FindBy(string userName, string password)
        {
            return FindOne(Expression.Eq("UserName", userName), Expression.Eq("Password", password));
        }
 
        public static User FindBy(string userName)
        {
            return FindOne(Expression.Eq("UserName", userName));
        }
 
        public static User FindBy(int id)
        {
            return FindOne(Expression.Eq("Id", id));
        }
 
        [PrimaryKey(PrimaryKeyType.Native, "user_id")]
        public int Id
        {
            get { return id; }
            set { id = value; }
        }
 
        [Property("user_name")]
        public string UserName
        {
            get { return userName; }
            set { userName = value; }
        }
 
        [Property("user_password")]
        public string Password
        {
            get { return password; }
            set { password = value; }
        }
 
        [Property("user_status")]
        public int Status
        {
            get { return status; }
            set { status = value; }
        }
 
        [BelongsTo("COMPANY_ID")]
        public Company Company
        {
            get { return company; }
            set { company = value; }
        }
    }
}

.Net Developer Kickin it with my MacBook Pro

2007-03-10T12:54:00.000-07:00

I've been using a Mac for almost a year now. Been using the 1st relase of the 15" MacBook Pro. What do I have to say about the experience? I love it!

I decided to get out of the windows world because of one thing. I wanted to have an OS that does all the stuff that I need to do for personal stuff such as picture maintenance, movie making, music production, etc... since the mac has iLife and GarageBand, I was sold.

Specs:
MacBook Pro Core Duo 2.16 Ghz
2 Gigs of RAM
100GB HDD

I was one of the people that purchased Parallels Desktop for $30 when it was still in Beta. Popped my XP CD, and been developing crazy apps on it.

XP on Parallels Specs:
XP Pro SP2
1.1GB of Ram
Coherence Mode
SQL Server 2005 Standard
Oracle 10g Standard
Visual Studio 2005 with Resharper

You may be asking "How do you like developing windows apps in Parallels?" It's kick ass! Definately separates my "work" with my "life" when it comes to systems. And parallels handles XP like nobody's business.

But then Windows Vista came along. I had Vista running in parallels for a little bit, but that damn OS is a resource HOG!!!

I have been avoiding BootCamp because I don't like rebooting to another OS just to do a specific task. But Vista is a pain and plus trying to be in the bleeding edge in .net development with all the 3.0 framework stuff that is coming, I had to install vista on bootcamp.

Vista on bootcamp was a painless install. I dont want to discuss how I installed it. Just google "Bootcamp Vista" and there are a lot of tutorials how to pimpafy it up.

Vista on Bootcamp Specs:
Vista Ultimate
SQL Server 2005 Std
VS.Net 2005 with Resharper

So if you are a .Net developer and wants a change, would I recomend this Mac stuff? HELL YES!!.

**UPDATE: I do feel dirty running windows on my mac. But gotta pay the bills.

Developer Heirarchy in a Development Team

2007-02-25T22:11:00.000-07:00

Lead Developer? Senior Developer? Junior Analyst? What does it all mean?

Well below is my heirarchy:

1) Developers

**UPDATE: Thanks to Eric Liu for the link!

JP Boodhoo's Nothin But .Net Bootcamp

2007-02-24T22:05:00.000-07:00

How was the training?
- F*cking, f*cking, f*cking AWESOME!!... I forgot to have another f*cking right beside f*cking.

For those people who missed out, what do you have to say.
- You f*cking missed out!

I couldn't afford it.
- Sell drugs. Don't even bother with weed.... Go blow, or even meth

Would you go again?
- Without a doubt

What was your JP moment?
- Friday - JP was just freestylin, spittin, bustin out crazy OO madness from 5PM - 11PM.

What did you not like about the course?
- Sitting right beside IglooCoder , and right in front of crazy legz

How many pizza's did you eat?
- A lot

Would you (me, Jonas) use what you have learned at work?
- F*ck ya!

So in Python calculation would you have to implement to rate this experience
- Jonas + Nerding + NothinButDotNet bootcamp = happy happy happy ^ 8========D

Again, thanks JP for coming up to Edmonton!

LINQ - Explicit Query

2007-02-09T23:01:00.000-07:00

This is for Justice Gray.

I had to watch ALL the movies. Took 5 hours, and DAMN it was worth it! I actually just wanted to see the credits!

 [Test]

        public void ShouldFindUsingLINQ()

        {

            List<Movie> movies = CreateMovie();

            var results = from m in movies

                          from a in m.Actors

                          where a.FirstName == "Hannah" &&

                               a.LastName == "Harper"

                            select new {a.FirstName, m.Title, a.ScreenName};

            foreach (var result in results)

            {

                Console.Out.WriteLine("{0} is an actress in the movie {1} and her screen name is {2}",

                                  result.FirstName, result.Title, result.ScreenName);

            }

            /*Output

             *Hannah is an actress in the movie 8 Inches and her screen name is Enduro Girl

             *Hannah is an actress in the movie Assploitations 4 and her screen name is Hanna 

             */

        }

        private static List<Movie> CreateMovie()

        {

            List<Movie> movies = new List<Movie>();

            movies.Add(CreateMovie("8 Inches", "Some chick that wished she swallowed 8 inches of wang ",

                                   CreateActor("Hannah", "Harper", "Enduro Girl")));

            movies.Add(CreateMovie("Internal Cumbustion 10", string.Empty,

                                       CreateActor("Evelyne ", "Foxy", "Evelyne"), 

                                       CreateActor("Jenna", "Haze   ", "Jenna"),

                                       CreateActor("Isabel", "Ice", "Isabel"),

                                       CreateActor("Kid", "Jamaica", "Jamaica"),

                                       CreateActor("Virginee ", string.Empty, "Virginee")));

            movies.Add(CreateMovie("Assploitations 4", string.Empty,

                                       CreateActor("Hannah", "Harper", "Hanna"), 

                                       CreateActor("Shayna", "Knight       ", "Shayna"),

                                       CreateActor("Lucy", "Lee", "Lucy"),

                                       CreateActor("Lauren", "Phoenix   ", "Lauren"),

                                       CreateActor("Aurora ", "Snow", "Aurora")));

            return movies;

        }

        private static Actor CreateActor(string firstName, string lastName, string screenName)

        {

            Actor actor = new Actor();

            actor.FirstName = firstName;

            actor.LastName = lastName;

            actor.ScreenName = screenName;

            return actor;

        }

        private static Movie CreateMovie(string title, string description, params Actor[] actors)

        {

            Movie movie = new Movie();

            movie.Title = title;

            movie.Description = description;

            movie.Actors = AddActors(actors);

            return movie;

        }

Mash it Up!

2007-02-06T21:36:00.001-07:00

eZed.ca

2007-02-04T22:26:00.000-07:00

I busted out the plastic, and bought myself http://www.ezed.ca.

Now, you can hit this blog up with ezed.ca! Too bad some bastards are squatting on the .com & .net... Ah well.

Incase you are wondering what I am using to forward my www subdomain, I am using a FREE dns server. It is afraid.org. I have been using this thing for years, and it's kick ass! Don't even bother with those dyndns crap.

Woot Woot!

Winter... Sooo Awesome!

2007-02-01T22:02:00.000-07:00

Here are some pics last weekend @ Lake Louise.... I'm the one skiing.

Validation Application Block - EL3 Beta (yaknowhatimsayin!?!?!?!)

2007-01-27T00:32:00.000-07:00

If you were wondering where I was for the past couple of weeks... It's winter! I snowboard, ski... not a lot of time for this programamamaming shtuff... That's when I'm bored out of my mind and have nothing "cool" to do. Don't get me wrong, I like programming... but not that much to take over my after work "activities".

I think I was reading david hayden's blog when I saw VAB for the very first time. I thought to my self, thats f***ing kick ass!

Seriously, don't you just hate creating "default" validation items for objects you need to validate? How come it took this long to get something like this to come out? I shouldnt whine... I tell you... its good shit!

Below is a sample code I whipped up for all ya suckahz out there that demonstrates not nullage, string lenghtage, and my custom validationage... Also you will notice a little bit of david hayden in the sample code. Mr. Hayden, if you are reading this, your sample was awesome!

I also would like to let Neil B. know that I STOLE his dog object that he used in his presentation @ Edmonton Code Camp 06. Take that FP!

Let's start with the tests...

    1 using app.domain;
    2 using Microsoft.Practices.EnterpriseLibrary.Validation;
    3 using NUnit.Framework;
    4 
    5 namespace test.domaintest
    6 {
    7     [TestFixture]
    8     public class DogTest
    9     {
   10         [Test]
   11         public void ShouldHaveValidDog()
   12         {
   13             Dog dog = CreateDog("Chiyo", Breed.GreatPyrenees, Color.White, Gender.Female);
   14             Assert.IsNotNull(dog);
   15             Assert.IsTrue(dog.IsValid());
   16             Assert.IsTrue(dog.IsDirty);
   17             Assert.IsTrue(dog.IsSavable());
   18         }
   19 
   20         [Test]
   21         public void ShouldInvalidateNoName()
   22         {
   23             Dog dog = CreateDog(string.Empty, Breed.GreatPyrenees, Color.White, Gender.Female);
   24             Assert.IsNotNull(dog);
   25 
   26             ValidationResults results = dog.Validate();
   27             Assert.IsFalse(results.IsValid);
   28             foreach (ValidationResult result in results)
   29             {
   30                 Assert.AreEqual(Dog.FIRST_NAME_LENGTH_ERROR_MESSAGE, result.Message);
   31             }
   32 
   33             Assert.IsFalse(dog.IsValid());
   34             Assert.IsTrue(dog.IsDirty);
   35             Assert.IsFalse(dog.IsSavable());
   36         }
   37 
   38         [Test]
   39         public void ShouldInvalidateNullBreed()
   40         {
   41             Dog dog = CreateDog("Chiyo", null, Color.White, Gender.Female);
   42             Assert.IsNotNull(dog);
   43 
   44             ValidationResults results = dog.Validate();
   45             Assert.IsFalse(results.IsValid);
   46             foreach (ValidationResult result in results)
   47             {
   48                 Assert.AreEqual(Dog.BREED_ERROR_MESSAGE, result.Message);
   49             }
   50 
   51             Assert.IsFalse(dog.IsValid());
   52             Assert.IsTrue(dog.IsDirty);
   53             Assert.IsFalse(dog.IsSavable());
   54         }
   55 
   56         [Test]
   57         public void ShouldHaveANonDirtyDog()
   58         {
   59             Dog dog = new Dog();
   60             Assert.IsFalse(dog.IsDirty);
   61         }
   62 
   63         [Test]
   64         public void ChiyoShouldNotBeLesbian()
   65         {
   66             Dog dog = CreateDog("Chiyo", Breed.GreatPyrenees, Color.White, Gender.Lesbian);
   67             Assert.IsNotNull(dog);
   68 
   69             ValidationResults results = dog.Validate();
   70             Assert.IsFalse(results.IsValid);
   71             foreach (ValidationResult result in results)
   72             {
   73                 Assert.AreEqual(ChiyoIsNotLesbianValidator.CHIYO_ERROR_MESSAGE, result.Message);
   74             }
   75 
   76             Assert.IsFalse(dog.IsValid());
   77             Assert.IsTrue(dog.IsDirty);
   78             Assert.IsFalse(dog.IsSavable());
   79         }
   80 
   81         private static Dog CreateDog(string name, Breed breed, Color color, Gender gender)
   82         {
   83             Dog dog = new Dog();
   84             dog.Name = name;
   85             dog.Breed = breed;
   86             dog.Color = color;
   87             dog.Gender = gender;
   88 
   89             return dog;
   90         }
   91     }
   92 }

The Code...

    1 using System;
    2 using Microsoft.Practices.EnterpriseLibrary.Validation;
    3 using Microsoft.Practices.EnterpriseLibrary.Validation.Validators;
    4 
    5 namespace app.domain
    6 {
    7     [ChiyoIsNotLesbianValidator]
    8     public class Dog : DomainObject<Dog>, IDomainObject
    9     {
   10         public const string FIRST_NAME_ERROR_MESSAGE = "Please enter first name";
   11         public const string FIRST_NAME_LENGTH_ERROR_MESSAGE = "Dog's name must have a maximum length of 50";
   12         public const string BREED_ERROR_MESSAGE = "Please select breed";
   13 
   14         private string name;
   15         private Breed breed;
   16         private Color color;
   17         private Gender gender;
   18 
   19 
   20         public Dog()
   21         {
   22         }
   23 
   24         public Dog(Validator validationService) : base(validationService)
   25         {
   26         }
   27 
   28         [NotNullValidator(MessageTemplate = FIRST_NAME_ERROR_MESSAGE)]
   29         [StringLengthValidator(1, 50, MessageTemplate = FIRST_NAME_LENGTH_ERROR_MESSAGE)]
   30         public string Name
   31         {
   32             get { return name; }
   33             set
   34             {
   35                 name = value;
   36                 base.IsDirty = true;
   37             }
   38         }
   39 
   40         [NotNullValidator(MessageTemplate = BREED_ERROR_MESSAGE)]
   41         public Breed Breed
   42         {
   43             get { return breed; }
   44             set
   45             {
   46                 breed = value;
   47                 base.IsDirty = true;
   48             }
   49         }
   50 
   51         public Color Color
   52         {
   53             get { return color; }
   54             set
   55             {
   56                 color = value;
   57                 base.IsDirty = true;
   58             }
   59         }
   60 
   61         public Gender Gender
   62         {
   63             get { return gender; }
   64             set
   65             {
   66                 gender = value;
   67                 base.IsDirty = true;
   68             }
   69         }
   70     }
   71 }

and here is my custom validator...

   73 namespace app.domain
   74 {
   75     public class ChiyoIsNotLesbianValidatorAttribute : ValidatorAttribute
   76     {
   77         protected override Validator DoCreateValidator(Type targetType)
   78         {
   79             return new ChiyoIsNotLesbianValidator(GetMessageTemplate(), Tag);
   80         }
   81     }
   82 
   83     public class ChiyoIsNotLesbianValidator : Validator<Dog>
   84     {
   85         public const string CHIYO_ERROR_MESSAGE = "Chiyo aint lesbian!";
   86         private string defaultMessageTemplate;
   87 
   88         public ChiyoIsNotLesbianValidator(string template, string tag)
   89             : base(template, tag)
   90         {
   91             defaultMessageTemplate = CHIYO_ERROR_MESSAGE;
   92         }
   93 
   94         protected override void DoValidate(Dog objectToValidate, object currentTarget, string key,
   95                                            ValidationResults validationResults)
   96         {
   97             try
   98             {
   99                 if (objectToValidate.Gender == Gender.Lesbian && objectToValidate.Name.ToLower() == "chiyo")
  100                     validationResults.AddResult(
  101                         new ValidationResult(CHIYO_ERROR_MESSAGE, string.Empty, string.Empty, string.Empty, this));
  102             }
  103             catch
  104             {
  105                 validationResults.AddResult(
  106                     new ValidationResult("Something messed up.", string.Empty, string.Empty, string.Empty, this));
  107             }
  108         }
  109 
  110         protected override string DefaultMessageTemplate
  111         {
  112             get { return defaultMessageTemplate; }
  113         }
  114     }
  115 }

Where the F**k is Jonas?

2006-11-28T00:40:00.000-07:00

Since it's been snowing here in the 780, I have been busy with snowboarding, skiing, and fu*king shovelling snow.

I should get back in to bustin some nyahhh, but that is one of the last things in my mind right now coz of the amount of the white stuff that has been dumped on us. But as for nyahhh, I have been bustin som .Net 3.0 sh*t like WCF (f*cking kick ass) & WPF. I will post something on those two later... when I feel like it.

So for now I will let all fellow readers watch the following kick ass youtube-age.

and this...

Nerdage...

2006-11-03T00:28:00.000-07:00

I presented at work some cool NYAHHH about the Service Layer (not web service) and my co-worker helped out with domain validation.

I think the code that I wrote for this 15+ minute presentation was pretty kick ass, so might at well share it to everyone.

Here are some of the patterns/OO design being used (a mix of GoF, and Fowler's PofEAA):
- Factory
- Domain Model
- Service Layer
- Unit of Work
- Data Mapper
- Dependendcy Injection
- Dependendcy Inversion
- Finder
- Model View Presenter
- etc...

And here are some technologies used:
- NHibernate
- NMock2
- NUnit

And here's the link to the .zip [download]

Note:

If you would like to run the application, download (1)Nhibernate, (2)NMock2, (3) SQL Server Express 2005 with (4)Northwind Database - here is the link on how to install the database.

Party in my pants...

2006-10-25T20:53:00.000-06:00

Two words... Serious Poundage.

The Dudesons

2006-10-25T00:38:00.002-06:00

NMock2... Rhino.Mocks' Nemesis

2006-10-22T23:56:00.000-06:00

I am a "Traditional" mocking guy... I write all my mocks, and got to the point that it has became very fast to implement. But sometimes I just wish that there is a good mocking tool out there.

I have tried Rhino, and I may be stupid (which I am) but I can't figure the damn thing out... I wish there was something that was very straight forward.

NMock2 to the rescue!

I have coded a quick Model View Presenter sample that uses NMock2. Enjoy.

The Test

[TestFixture]

public class DJInventoryPresenterTest

    private Mockery mocks;

    private DJInventoryPresenter presenter;

    private IDJInventoryTask task;

    private IDJInventoryView view;

    [SetUp]

    public void SetUp()

        mocks = new Mockery();

        task = mocks.NewMock<IDJInventoryTask>();

        view = mocks.NewMock<IDJInventoryView>();

        presenter = new DJInventoryPresenter(view, task);

    [TearDown]

    public void TearDown()

        mocks.VerifyAllExpectationsHaveBeenMet();

    [Test]

    public void ShouldAdd()

        Expect.Once.On(view).GetProperty("Name");

        Expect.Once.On(view).GetProperty("Description");

        Expect.Once.On(view).SetProperty("Id");

        Expect.Once.On(task).Method("Add").Will(Return.Value(1));

        presenter.Add();

    [Test]

    public void ShouldDelete()

        Expect.Once.On(view).GetProperty("Name");

        Expect.Once.On(view).GetProperty("Description");

        Expect.Once.On(view).GetProperty("Id").Will(Return.Value(1));

        Expect.Once.On(task).Method("Delete");

        presenter.Delete();

    [Test]

    public void ShouldUpdate()

        Expect.Once.On(view).GetProperty("Name");

        Expect.Once.On(view).GetProperty("Description");

        Expect.Once.On(view).GetProperty("Id").Will(Return.Value(1));

        Expect.Once.On(view).SetProperty("IsUpdated");

        Expect.Once.On(task).Method("Edit").Will(Return.Value(true));

        presenter.Update();

    [Test]

    public void ShouldGetById()

        Expect.Once.On(view).SetProperty("Name");

        Expect.Once.On(view).SetProperty("Description");

        Expect.Once.On(view).GetProperty("Id").Will(Return.Value(1));

        Expect.Once.On(task).Method("GetDJInventoryById").Will(Return.Value(CreateDJInventory()));

        presenter.GetDJInventoryById();

    [Test]

    public void ShouldGetAll()

        Expect.Once.On(view).SetProperty("AllInventories");

        Expect.Once.On(task).Method("GetAllDJInventories").Will(

            Return.Value(new DJInventory[] {CreateDJInventory()}));

        presenter.GetAllInventories();

    private DJInventory CreateDJInventory()

        DJInventory inventory = new DJInventory();

        inventory.Name = "Test";

        inventory.Description = "Test Description";

        return inventory;

The Presenter

public class DJInventoryPresenter

    private readonly IDJInventoryView view;

    private readonly IDJInventoryTask task;

    public DJInventoryPresenter(IDJInventoryView view, IDJInventoryTask task)

        this.view = view;

        this.task = task;

    public void Add()

        DJInventory inventory = CreateDJInventoryFromView(view, true);

        view.Id = task.Add(inventory);

    public void Delete()

        task.Delete(CreateDJInventoryFromView(view, false));

    public void Update()

        view.IsUpdated = task.Edit(CreateDJInventoryFromView(view, false));

    public void GetDJInventoryById()

        DJInventory result = task.GetDJInventoryById(view.Id);

        view.Name = result.Name;

        view.Description = result.Description;

    private DJInventory CreateDJInventoryFromView(IDJInventoryView view, bool ignoreId)

        DJInventory inventory = new DJInventory();

        inventory.Name = view.Name;

        inventory.Description = view.Description;

        if (!ignoreId)

            inventory.Id = view.Id;

        return inventory;

    public void GetAllInventories()

        view.AllInventories = CreateDataTable(task.GetAllDJInventories());

    private DataTable CreateDataTable(DJInventory[] inventories)

        DataTable dt = new DataTable();

        CreateColumns(dt);

        CreateRows(dt, inventories);

        return dt;

    private void CreateColumns(DataTable dt)

        dt.Columns.Add("ID");

        dt.Columns.Add("Name");

        dt.Columns.Add("Description");

    private void CreateRows(DataTable dt, DJInventory[] inventories)

        foreach (DJInventory inventory in inventories)

            dt.Rows.Add(CreateRow(dt, inventory));

    private DataRow CreateRow(DataTable dt, DJInventory inventory)

        DataRow row = dt.NewRow();

        row["ID"] = inventory.Id;

        row["Name"] = inventory.Name;

        row["Description"] = inventory.Description;

        return row;

Switch Statement = Ghetto... Enum = Ghetto

2006-10-22T22:15:00.000-06:00

U like the title? Aww yeaa foo!

I like bustin' some OOP nyahh all the time, and some of the developers I have paired with notice two things: (1) I don't do switch statements, (2) I rarely (never) use enums...

Why you ask?

Switch / Case: It's gay.
Switch / Case: Too much code in the containing class.
Switch / Case: Can become complex.
Switch / Case: Containing class needs to be changed when a condition is added/changed.
Switch / Case: A 'case' is hard coded "case IsUgly:"

Enum: It's just a frigging int...
Enum: It's gay.

I will show you some cool tricks how to get rid of the nastyness...

Okay... here is a test.

[Test]

public void ShouldDJ()

    Person jonas = new Person("Jonas");

    jonas.Do(DoSomething.DJ);

    Assert.AreEqual("DJ", jonas.IsDoing);

Okay, nothing fancy... we are verifying that Person is DJing. But now here comes the ugly.

public enum DoSomething

    DJ = 1,

    BMX = 2,

    GetDrunk = 3

What the F**k is that!?!? That's the enum! we are just replacing numbers with something readable... So nasty!

Here's the Person object:

public class Person

    private readonly string name;

    private string isDoing;

    public Person(string name)

        this.name = name;

    public string Name

        get { return name; }

    public void Do(DoSomething doStuff)

        switch(doStuff)

            case DoSomething.DJ:

                isDoing = "DJ";

                break;

            case DoSomething.BMX:

                isDoing = "BMX";

                break;

            case DoSomething.GetDrunk:

                isDoing = "Aww yeaa foo!";

                break;

    public string IsDoing

        get { return isDoing; }

I know I coded a switch for this sample (almost made me throw up).

So what is the big deal with using enums or switch?

Three words: Object Oriented Programming. You basically make objects to build your application. Yes, they make take longer to develop, but they are waaaay more maintainable. And if you programmed it so it can be readable, you can read your code like a story.

How can we fix the code that you showed above?

First off, you will notice the Person() object has a method called "Do". What do you see very similar to what it's doing?... Yess they all set "IsDoing" property with a value which is a string.

What we need to implement is a strategy pattern:

public abstract class WhatToDoStrategy

    public static WhatToDoStrategy DJ = new DJStrategy();

    public static WhatToDoStrategy BMX = new BMXStrategy();

    public static WhatToDoStrategy GET_DRUNK = new GetDrunkStrategy();

    public abstract string Do { get; }

    private class DJStrategy : WhatToDoStrategy

        public override string Do

            get { return "DJ"; }

    private class BMXStrategy : WhatToDoStrategy

        public override string Do

            get { return "BMX"; }

    private class GetDrunkStrategy : WhatToDoStrategy

        public override string Do

            get { return "Aww yea foo!"; }

With the WhatToDoStrategy() strategy, our Person() object is now "naked" to all the logic when it comes to what it needs to do... it will simply just call an object.

Sometimes, you may not want to call your strategy directly. As for this example, I created an interface called IStuffToDo that is taken in by Person() object.

public interface IStuffToDo

    WhatToDoStrategy Doing();

public class DJing : IStuffToDo

    public WhatToDoStrategy Doing()

        return WhatToDoStrategy.DJ;

public class BMXing : IStuffToDo

    public WhatToDoStrategy Doing()

        return WhatToDoStrategy.BMX;

public class GettingDrunk : IStuffToDo

    public WhatToDoStrategy Doing()

        return WhatToDoStrategy.GET_DRUNK;

The code above replaces the enum we had. This is wayyyyyy better. now when you look at the code for DJing(), you know it is calling the DJ strategy, not a fu*king number 1 which doesnt make any sense.

Here is the modification to the Person() object:

    public class Person

        //...

        public void Do(IStuffToDo stuffToDo)

            isDoing = stuffToDo.Doing().Do;

        //...

Notice how it is taking in an IStuffToDo object, which in turn calls our strategy...

Lastly, how do we verify if this code works? Tests!!!!

[TestFixture]

public class PersonTest

    [Test]

    public void ShouldDJ()

        Person jonas = new Person("Jonas");

        jonas.Do(new DJing());

        Assert.AreEqual("DJ", jonas.IsDoing);

    [Test]

    public void ShouldBMX()

        Person jonas = new Person("Jonas");

        jonas.Do(new BMXing());

        Assert.AreEqual("BMX", jonas.IsDoing);

    [Test]

    public void ShouldGetDrunk()

        Person jonas = new Person("Jonas");

        jonas.Do(new GettingDrunk());

        Assert.AreEqual("Aww yea foo!", jonas.IsDoing);

Nyahhh!!!

A Conversation While Contemplating Buying Skis using a Mediator Pattern

2006-10-16T22:16:00.000-06:00

using System.Collections.Generic;

using NUnit.Framework;

namespace jonas.patterns.behavioral.mediator

    [TestFixture]

    public class MediatorTest

        [Test]

        public void ShouldBuySkis()

            Store pacesetterSkiShop = new Store();

            Person suzie = new SalesPerson("Suzie");

            Person jonas = new Customer("Jonas");

            pacesetterSkiShop.Add(suzie);

            pacesetterSkiShop.Add(jonas);

            suzie.Message = "Finding what you are looking for?";

            suzie.Talk(jonas);

            Assert.AreEqual("Sales Person Suzie says: Finding what you are looking for?", jonas.Recieve(suzie));

            jonas.Message = "I'm looking for skis. Can you help me out?";

            jonas.Talk(suzie);

            Assert.AreEqual("Customer Jonas says: I'm looking for skis. Can you help me out?", suzie.Recieve(jonas));

            suzie.Message = "Sure what kind are you looking at?";

            suzie.Talk(jonas);

            Assert.AreEqual("Sales Person Suzie says: Sure what kind are you looking at?", jonas.Recieve(suzie));

            jonas.Message = "Actually, I just want your number...";

            jonas.Talk(suzie);

            Assert.AreEqual("Customer Jonas says: Actually, I just want your number...", suzie.Recieve(jonas));

            suzie.Message = "Get the hell out of this store!";

            suzie.Talk(jonas);

            Assert.AreEqual("Sales Person Suzie says: Get the hell out of this store!", jonas.Recieve(suzie));

    internal class Customer : Person

        public Customer(string name) : base(name)

        public override string Recieve(Person otherPerson)

            return string.Format("Sales Person {0}", base.Recieve(otherPerson));

    internal class SalesPerson : Person

        public SalesPerson(string name) : base(name)

        public override string Recieve(Person otherPerson)

            return string.Format("Customer {0}", base.Recieve(otherPerson));

    internal class Person

        private string name;

        private string message;

        private Store store;

        public Person(string name)

            this.name = name;

        public string Name

            get { return name; }

        public string Message

            get { return message; }

            set { message = value; }

        public Store Store

            set { store = value; }

        public void Talk(Person otherPerson)

            store.Talk(otherPerson, this);

        public virtual string Recieve(Person otherPerson)

            return string.Format("{0} says: {1}", otherPerson.Name, otherPerson.Message);

    internal class Store

        private Dictionary<string, Person> people;

        public Store()

            people = new Dictionary<string, Person>();

        public void Add(Person person)

            if (!people.ContainsKey(person.Name))

                people.Add(person.Name, person);

                person.Store = this;

        public void Talk(Person from, Person to)

            if (people.ContainsKey(to.Name))

                to.Recieve(from);